Paper straightening device for duplicating machines



MACHINES Aprii H. JAGGER PAPER STRAIGHTENING DEVICE FOR DUPLICATING 2Sheets-Sheet l Filed May 26, 1954 H. JAGGER April 2%, 1936.

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MACHINES PAPER STRAIGHTENING DEVICE FOR DUPLICATING Filed May 26, 1934 2Sheets-Sheet 2 172M652 far: 11212767"?! Jay 8 r,

Patented Apr. 28, 1936 PATENT OFFlQE PAPER STRAIGHTENING DEVICE FORDUPLICATING MACHINES Hubert Jagger, Chicago, Ill.,

Incorporated, Chicago, 111.,

West Virginia assignor to Ditto, a. corporation of Application May 26,1934, Serial No. 727,636

2 Claims.

This invention relates to duplicating machines of the type wherein aroller is adapted to press a copy sheet down upon a printing surface. Inmachines of the type to which this invention relates, there isusually'provided a bed plate or platen upon which a gelatin orhectograph sheet is supported.

A suitable carriage is movably mounted over the bed plate so that it maybe moved lengthwise of the bed plate. This'carriage is provided with aplaten roller for pressing the copy sheets down against the gelatinsurface and may, or may not, have a pressure roller cooperating with theplaten roller to feed the copy sheets. A

paper guide is mounted on the carriage and there isa margin bar which isadapted to be engaged by the edge of the copy sheet to position thepaper.

,I n machines of this character, when'the copy Sheets are being removedafter being rolled down on a, printing surface, they are inclined to becurved-because of the fact that they have been pressed into a more orless curved condition by the platen roller and the pressure roller.

It is a purpose of this invention to provide means for straightening outthe copy sheets as the paper is stripped off the gelatin surface.

' More specifically it is a purpose of this invention to provide meanscooperating with the 80 platen roller to cause a straightening of thecopy sheets as they are stripped from the gelatin surface .on the returnmovement of the carriage.

Other objects and advantages of the invention will appear as thedescription progresses in con- 35 nection with the accompanying drawingsin which- Fig. 1 is a plan view of a duplicating machine embodying myinvention;

Fig. 2 is a section on the line 22 ofFig. 1-;

40 Fig. 3 is a plan section substantially on the line 3-3 of Fig. 2;

Fig. 4. is a reduced section similar to the section of Fig. 2, butshowing a modified form; and Fig. 5 is a similar section showing aslightly 45 dilferent modification.

Referring now to the drawings wherein a pre- 7 ferred embodiment isillustrated, A designates the frame of the duplicating machine, Bdesignates the bed plate or platen mounted on the 50 frame A, and Cdesignates the carriage which is slidable lengthwise of the frame A andwhich is adapted to apply a copy sheet to the gelatin or duplicatingband D which is stretched over the bed plate B.

55 The mechanism constituting the present invention is located wholly onthe carriage C and the future description will be substantially limitedthereto, it being understood that this carriage is adapted to be movedto the right as shown in Figs. 1 and 2 in placing the sheet down on the5'5 gelatin band and then is given a return movement to the left instripping the sheet off of the band in preparation for applying a newsheet.

The carriage has mounted therein the platen roller ll! which ispivotally supported by a pair of arms such as H and I 2, there being oneof these arms at each side of the carriage. These arms are keyed uponthe shaft l3 which is journaled in suitable bearings at M and I5 in thecarriage frame. The operating handle or arm position. This isaccomplished by the coil springs 23' I8 and I9 which as shown, areconnected at one end' to the arm as indicated most clearly at 29 in Fig.2, while the other end of the spring after being coiled around the shaftl3 is'secured to the depending bracket 2| on the carriage 30"- frame, itbeing understood, of course, that there is a bracket for each spring.

The pressure roller 22 is suspended on suitable arms such as 23 and 24and is urged into contact with the platen roller by means of the springs25 and 26. The structure is shown most clearly in Figs. 2 and 3.

A paper guide 2l' is mounted in the carriage frame so as to feed paperdown over the pressure roller and between the pressure roller and theplaten roller in a manner which is well known in the art.

There is provided a margin bar 28 for properly aligning the copy sheetsand positioning them with respect to the duplicating surface.

The structure so far described is more or less well known and itsoperation it is believed, will be clear from the description just given.

Now in operating the carriage after the sheet is fed beneath the platenroller and the platen roller is lowered to press the sheet against theduplicating surface, the carriage is moved forward, that is, to theright in Fig. 2 so that the sheet is fed down between the rollers I0 and22 to the duplicating surface. However, the end of the sheet'is leftbetween the rollers at the end of the duplicating step. On the return ofthe carriage the rollers act to strip the paper from the duplicatingsurface and feed it upwardly. Owing to the pressure exerted by therollers, the sheet is inclined to curve over the platen roller and tocome out of the machine in this curved condition. This condition of thecopy sheet is particularly noticeable where cards or heavy stiff paperis being used for the copies. To overcome this diificulty, I providemeans for straightening the copy sheet as it is stripped off theduplicating surface.

In the form shown in Fig. 2, this means consists of a bar 30 which liesdirectly over the junction between the platen roller and the pressureroller and which as shown in cross-section in Fig. 2, has rounded smoothedges so as to guide the copy sheet in the direction shown in Fig. 2.This guide presses the sheet back into straight position and eliminatesa great deal of the curved condition which is objectionable. The bar 30is supported at its opposite ends by the brackets 31 and 32 which asshown most clearly in Fig. 3, have, an angle portion riveted to theplaten roller arm and the bracket has the upstanding portion indicated,for example, at 33 on bracket 3| to which the bar 30 is secured.

Now in certain of the machines no pressure roller is used and in such amachine the paper is fed directly from the paper guide beneath theplaten roller. In this type of machine I prefer to provide a somewhatdifferent means for stripping the paper and returning it to the paperguide. It might be mentioned at this time that the straightening cf thepaper as indicated in Fig. 2 will cause the sheet to fall back upon thepaper guide rather than over the carriage frame as it did when in curvedcondition.

In Fig. 4 the carriage structure and the platen roller carryingstructure is substantially the same as in Figs. 1 to 3, but in this casethe paper guide 21 has been lowered in the carriage frame by cuttingaway the carriage frame as indicated at 35 so that the guide lies muchmore nearly in a horizontal position, making an angle of somewherebetween ten and fifteen degrees with the horizontal. This paper guidehas its lower end 36 extended down close to the platen roller and justabove the surface of the duplicating band. Also it is preferable to givethe lower end portion of the paper guide from a point indicatedapproximately at 31 in Fig. 4, a somewhat greater angle with respect tothe bed plate to facilitate the stripping of the paper in the mannerwhich will now be described.

In the operation of this type of carriage, the copy sheet is placedbeneath the platen roller and against the margin bar in the usualfashion and the carriage is pushed to the right as shown in Fig. 4 toroll the sheet down upon the duplicating surface. The carriage isstopped, however,

guide 21' before the end of the sheet moves off the paper and on thereturn movement of the carriage the lower edge 36 of the paper guidefunctions to strip the sheet from the duplicating surface and guide itupwardly along the paper guide. Owing to the fact that the paper guideis dropped so low there is very little curvature imparted to the sheetby pressing it upon the duplicating surface so that by its own weight,the sheet will flatten down as it is fed up along the paper guide in thereturn movement of the carriage. It is sometimes necessary with copymaterial that is particularly bad to curl to utilize additional meansfor causing the paper to lie down in the paper guide during thestripping operation.

To accomplish this I have provided means which is shown most clearly inFig. 5. This means consists of the guiding member 38 which is bent upfrom the side of the paper guide and then extended over the paper guideas shown so as to hold the paper down as it is stripped from duplicatingsurface. The upper end of this member 38 is bent upwardly as indicatedat 39 to aid in inserting the copy sheets.

While a certain embodiment of the invention has been shown anddescribed, it is to be understood that it is capable of manymodifications. Changes therefore in the construction and arrangement maybe made without departing from the spirit and scope of the invention asdisclosed in the appended claims in which it is intended to claim allnovelty inherent in the invention as broadly as possible in view of theprior art.

Having thus described the invention, what I claim as new and desire tosecure by Letters Patent is:

1. In a duplicating machine, a platen, a carriage adapted to move oversaid platen to apply a copy sheet to a duplicating surface on saidplaten, and to strip the sheet from said surface, a platen roller, apaper guide for guiding the copy sheet to the platen roller, a pressureroller, and means for bending the copy sheet back over the guide on thestripping movement of the carriage, said means comprising a bar abovethat portion of the platen roller which is adjacent to the pressureroller, said bar having rounded upper and lower edges.

2. In a duplicating machine, a platen, a carriage adapted to move oversaid platen to apply a sheet to a duplicating surface on said platen,and to strip the sheet from said surface, a platen roller, arms pivotedon said carriage and supporting said roller, a paper guide for guiding asheet to said platen roller, and means for bending the sheet back overthe paper guide on the stripping movement of said carriage, said meanscomprising brackets on said arms, a bar connecting said brackets andspaced above the portion of said roller nearest the paper guide.

HUBERT JAGGER.

